<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script type="text/javascript">
/*typeof：直接量
        用来判断数据类型
        可不加双括号*/
			console.log(typeof("abc"));
			console.log(typeof(123));
			
			console.log(typeof "abc")
			console.log(typeof 123)
		</script>
	</head>
	<body>
	</body>
</html>
